7(1-2b)=21

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Solution for 7(1-2b)=21 equation: 



7(1-2b)=21

We move all terms to the left:

7(1-2b)-(21)=0

We add all the numbers together, and all the variables

7(-2b+1)-21=0

We multiply parentheses

-14b+7-21=0

We add all the numbers together, and all the variables

-14b-14=0

We move all terms containing b to the left, all other terms to the right

-14b=14

b=14/-14

b=-1

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